NCIS: Los Angeles has enlisted ‘Gossip Girls’ alum Michelle Trachtenberg to play the victim of a home invasion, TV Line reports. Showrunner Shane Brennan of the series promises an interesting episode. “We’re very excited to have Michelle guest on the show. It’s a very intense episode which pairs Michelle with Callen and Sam (played by actors Chris O’Donnell and LL Cool J), in what is probably one of our biggest action shows so far this season.”